Iíve got left and right both ďpoppedĒ. Iíve broken everything loose and tried dropping it just a little to pry the rest and the furthest she has gotten are the splines on the axle. Right now Iím putting the diff back up and putting bolts back to try and pry them all the way out again. Iím playing with different angles and Iím not having much luck.

Iíve got left and right both ďpoppedĒ. Iíve broken everything loose and tried dropping it just a little to pry the rest and the furthest she has gotten are the splines on the axle. Right now Iím putting the diff back up and putting bolts back to try and pry them all the way out again. Iím playing with different angles and Iím not having much luck.

Putting the diff back up is not going to help, you need to lower the diff as much as possible to get the necessary clearance to remove the axle. You may even need
to twist the diff a little to get one side free first, then the other will come out easy... Wish I could be there to help, we could have it out in no time.

I supposed if you had to you could unbolt the lower control, sway bar link and #1 arm assembly to pivot the lower arm and axle out of the diff,
but that should not be necessary.

If I had one more set of hands this thing would have been done. Right now, with only me working on it, my best bet is to start some disassembly of the suspension. Iíve only gotten everything broken loose, I donít have a control arm puller/ remover to pop the arms out. Hitting it with a hammer and theyíre not budging. But yeah, Iíve realized I need to drop it as much as possible. Iím going to resume tomorrow, got some stuff to do tonight!

If I had one more set of hands this thing would have been done. Right now, with only me working on it, my best bet is to start some disassembly of the suspension. Iíve only gotten everything broken loose, I donít have a control arm puller/ remover to pop the arms out. Hitting it with a hammer and theyíre not budging. But yeah, Iíve realized I need to drop it as much as possible. Iím going to resume tomorrow, got some stuff to do tonight!

That's where I ended up too. The only suggestion is you might be able to do one side at a time instead of both at the same time. Not sure how much height you have to work with though. I believe those who have been able to do this without disassembling the suspension had the car up on a lift with lots of room to drop the diff. If you're on 24" jackstands, I don't think you can get the diff low enough from the chassis, which is why I ended up disassembling a whole bunch of rear suspension bits.

Seems like the general consensus is that the IS350 differential is too aggressive for the ISF. So, I have on order a GS350 rear differential carrier assembly. Through searching on this forum, someone did a direct swap with the IS350 diff on a GS350, so my thoughts are if that is a direct fit, GS350 to ISF in theory is a direct fit. GS350 diff is 3.679 vs the ISF 2.973. If anyone is interested and would like me to start a new thread outlying my thoughts on this once I get it installed, let me know. I'm set to receive the carrier on 5/9/2019 (according to fedex tracking). I should be able to get to the install Friday evening if not this Thursday, I only have one set of hands though , no one I know is a "car guy/gal" around me. I'll test responsiveness in manual and auto throughout the city and I'll go to some back roads to simulate highway speeds and of course, do some WOT. These are my initial thoughts using rpm/mph calculators on dragtimes.com and analyzing what I will be at in the city... I usually shift around 2400 rpm for city driving until I am at a cruising speed which is 45 in G8 at 1200rpm (usually downshifts me to G7 if I dip under 45) or 60 in G8 at 1600rpm. So at 2400rpm until that, my MPH from G1-G4 is 13.6, 22.95, 33.55, 42.7. If I stay with the same driving style, I will need G1-G5 10.99, 18.54, 27.11, 34.5, 41.03. 45 in G8 at ~1500rpm or 60 in G8 at ~2000rpm. As you can tell, I am bored, sorry for the ramble!

Do you have any "before" quarter or eighth mile drag timeslips with which to document the actual change this will make to the performance of your car?

Do you have any "before" quarter or eighth mile drag timeslips with which to document the actual change this will make to the performance of your car?

Ive got many passes at the quarter (got damn near every slip) Some with stock, some with exhaust and tune. Some with e32 mix vs 93. All on street tires so yes, i will be able to identify actual performance.